a)

b)

Give two examples of potential energy becoming
kinetic energy.

a)

b)

What is the formula for calculating the
efficiency of a machine?

Why do you always multiply the efficiency
by 100?

If a container weighs 58 N, then it should
take 580 J of work to move it 10 m up a ramp. However, it actually
takes 640 J of energy to move it due to friction. What is the efficiency
of this system?

Define and give an example in parenthesis:

open system

closed system

What is a perpetual motion machine?

Why is it impossible to build a perpetual
motion machine?

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